SeaClan reigns peacefully alongside its sister-Clan, SkyClan. The difference between the two is that one borders the ocean, while the other is crowded with tall, leafy trees. The deputy of SeaClan is a quiet she-cat with the name of Hollytail. Her calm life erupts with tragedy when rogues start appearing in SeaClan territory. After the death of a Clanmate, she sets out to find the culprit, but uncovers something she never imagined.